本文介绍了在JsonCpp中遍历对象的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我有一个使用解码JSON字符串的C ++应用程序。我创建了以下函数,但它只显示我的顶级对象...
如何让它转储整个对象列表?
- 功能 -
SaveJSON(json_data) ;
bool CDriverConfigurator :: PrintJSONTree(Json :: Value& root,unsigned short depth / * = 0 * /)
{
printf({type = [%d ],size =%d},root.type(),root.size());
if(root.size()> 0){
for(Json :: ValueIterator itr = root.begin(); itr!= root.end(); itr ++){
PrintJSONTree(itr.key(),depth + 1);
}
return true;
}
//打印深度。
for(int tab = 0; tab< depth; tab ++){
printf( - );
}
if(root.isString()){
printf(%s,root.asString()。c_str());
} else if(root.isBool()){
printf(%d,root.asBool());
} else if(root.isInt()){
printf(%d,root.asInt());
} else if(root.isUInt()){
printf(%d,root.asUInt());
} else if(root.isDouble()){
printf(%f,root.asDouble()
}
else
{
printf(unknown type = [%d],root.type());
}
printf(\\\
);
return true;
}
---输入---- / p>
{
modules:[
{
config:{
bbbbbbbbbbbbbbbbb
DeviceID:这是名称,
Function:01_READ_COIL_STATUS,
Length:99,
Scan:111 ,
Type:Serve
}
},
{
config:{
position:[
13,
17
]
},
name:Modbus连接,
value:{
Baud:9600 ,
timeout:2.5
}
},
{
config:{
position:[
b
145
]
},
name:Modbus Device,
value:{
DeviceID 55
}
},
{
config:{
position:[
363,
512 $ b b
},
name:Function Something,
value:{
}
}
config:{
position:[
404,
701
]
},
name:Function
value:{
}
}
],
properties:{
Blarrg ,
description:,
name:Modbus
},
wires:[
{
src :{
moduleId:1,
terminal:modbus.connection.output
},
tgt:{
moduleId :2,
terminal:modbus.connection.input
}
},
{
src:{
moduleId :2,
terminal:modbus.device.output
},
tgt:{
moduleId:0,
:modbus.device.output
}
},
{
src:{
moduleId:3,
terminal :dataOut
},
tgt:{
moduleId:4,
terminal:dataIn
}
} ,
{
src:{
moduleId:3,
terminal:dataIn
},
tgt {
moduleId:0,
terminal:data1
}
}
]
}
- 输出 -
{type = [7],size = 3} {type = [4],size = 0} - modules
{type = [4],size = $ b {type = [4],size = 0} - wires
解决方案>
你有一些错误相关,似乎没有一个伟大的处理递归或JSON的key->值本质以及如何与你使用的库相关。我没有测试这个代码,但它应该工作更好。
void CDriverConfigurator :: PrintJSONValue Value& val)
{
if(val.isString()){
printf(string(%s),val.asString()。c_str());
} else if(val.isBool()){
printf(bool(%d),val.asBool()
} else if(val.isInt()){
printf(int(%d),val.asInt()
} else if(val.isUInt()){
printf(uint(%u),val.asUInt());
} else if(val.isDouble()){
printf(double(%f),val.asDouble());
}
else
{
printf(unknown type = [%d],val.type());
}
}
bool CDriverConfigurator :: PrintJSONTree(const Json :: Value& root,unsigned short depth / * = 0 * /)
{
depth + = 1;
printf({type = [%d],size =%d},root.type(),root.size());
if(root.size()> 0){
printf(\\\
);
for(Json :: ValueIterator itr = root.begin(); itr!= root.end(); itr ++){
//打印深度。
for(int tab = 0; tab< depth; tab ++){
printf( - );
}
printf(subvalue();
PrintJSONValue(itr.key());
printf() - );
PrintJSONTree(* itr,depth);
}
return true;
} else {
printf();
PrintJSONValue(root);
printf(\\\
);
}
return true;
}
I have a C++ application that uses jsoncpp to decode a JSON string. I have created the following function but it only shows me the top level objects...
How do I get it to dump the entire object list?
--Function--
SaveJSON( json_data );
bool CDriverConfigurator::PrintJSONTree( Json::Value & root, unsigned short depth /* = 0 */)
{
printf( " {type=[%d], size=%d} ", root.type(), root.size() );
if( root.size() > 0 ) {
for( Json::ValueIterator itr = root.begin() ; itr != root.end() ; itr++ ) {
PrintJSONTree( itr.key(), depth+1 );
}
return true;
}
// Print depth.
for( int tab = 0 ; tab < depth; tab++) {
printf( "-");
}
if( root.isString() ) {
printf( " %s", root.asString().c_str() );
} else if( root.isBool() ) {
printf( " %d", root.asBool() );
} else if( root.isInt() ) {
printf( " %d", root.asInt() );
} else if( root.isUInt() ) {
printf( " %d", root.asUInt() );
} else if( root.isDouble() ) {
printf( " %f", root.asDouble() );
}
else
{
printf( " unknown type=[%d]", root.type() );
}
printf( "\n" );
return true;
}
--- Input ----
{
"modules":[
{
"config":{
"position":[
129,
235
]
},
"name":"Modbus Task",
"value":{
"DeviceID":"This is the name",
"Function":"01_READ_COIL_STATUS",
"Length":"99",
"Scan":"111",
"Type":"Serve"
}
},
{
"config":{
"position":[
13,
17
]
},
"name":"Modbus Connection",
"value":{
"Baud":"9600",
"timeout":"2.5"
}
},
{
"config":{
"position":[
47,
145
]
},
"name":"Modbus Device",
"value":{
"DeviceID":"55"
}
},
{
"config":{
"position":[
363,
512
]
},
"name":"Function Something",
"value":{
}
},
{
"config":{
"position":[
404,
701
]
},
"name":"Function Something",
"value":{
}
}
],
"properties":{
"Blarrg":"",
"description":"",
"name":"Modbus"
},
"wires":[
{
"src":{
"moduleId":1,
"terminal":"modbus.connection.output"
},
"tgt":{
"moduleId":2,
"terminal":"modbus.connection.input"
}
},
{
"src":{
"moduleId":2,
"terminal":"modbus.device.output"
},
"tgt":{
"moduleId":0,
"terminal":"modbus.device.output"
}
},
{
"src":{
"moduleId":3,
"terminal":"dataOut"
},
"tgt":{
"moduleId":4,
"terminal":"dataIn"
}
},
{
"src":{
"moduleId":3,
"terminal":"dataIn"
},
"tgt":{
"moduleId":0,
"terminal":"data1"
}
}
]
}
--Output--
{type=[7], size=3} {type=[4], size=0} - modules
{type=[4], size=0} - properties
{type=[4], size=0} - wires
解决方案
You have some errors related to seemingly not having a great handle on recursion or the key->value nature of JSON and how that relates to the library you're using. I haven't tested this code at all, but it should work better.
void CDriverConfigurator::PrintJSONValue( const Json::Value &val )
{
if( val.isString() ) {
printf( "string(%s)", val.asString().c_str() );
} else if( val.isBool() ) {
printf( "bool(%d)", val.asBool() );
} else if( val.isInt() ) {
printf( "int(%d)", val.asInt() );
} else if( val.isUInt() ) {
printf( "uint(%u)", val.asUInt() );
} else if( val.isDouble() ) {
printf( "double(%f)", val.asDouble() );
}
else
{
printf( "unknown type=[%d]", val.type() );
}
}
bool CDriverConfigurator::PrintJSONTree( const Json::Value &root, unsigned short depth /* = 0 */)
{
depth += 1;
printf( " {type=[%d], size=%d}", root.type(), root.size() );
if( root.size() > 0 ) {
printf("\n");
for( Json::ValueIterator itr = root.begin() ; itr != root.end() ; itr++ ) {
// Print depth.
for( int tab = 0 ; tab < depth; tab++) {
printf("-");
}
printf(" subvalue(");
PrintJSONValue(itr.key());
printf(") -");
PrintJSONTree( *itr, depth);
}
return true;
} else {
printf(" ");
PrintJSONValue(root);
printf( "\n" );
}
return true;
}
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10-18 20:23